Fig. 3

Biplot of principal component analysis (PCA) for landscape metrics and land cover in 25-m (a), 50-m (b), 100-m (c) and 200-m (d) buffers around residential yards, and examples of yards with low (e) and high (f) PC1 loadings. Abbreviations for landscape metrics: Cohesion, patch cohesion index; enn_mn, mean of Euclidean nearest neighbor; np, number of patches; clumpy, clumpiness index; nlsi, normalized landscape shape index; ai., aggregation index; iji, interspersion and juxtaposition index; mesh, effective mesh size; te, total edge; ed, edge density; lpi, largest patch index; gyrate_mn, mean radius of gyration; contig_mn, mean of contiguity index; tca, total core area; cpland, core area percentage of landscape; ndca, number of disjunct core areas. Abbreviations for landcover classes: Grass, area of grass; low canopy, area of low canopy; high canopy, area of high canopy; impervious, area of impervious surface